[issue27141] Fix collections.UserList shallow copy

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

Either of the patches looks fine.  I lean a bit towards the opt1 patch.

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assignee: rhettinger -> serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue27141>
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